Gui: Added FreeTurntable orbit style (#8048)

* Added FreeTurntable orbit style

src/Gui/DlgSettingsNavigation.ui

@@ -279,10 +279,11 @@ Select a set and then press the button to view said configurations.</string>
         <property name="toolTip">
          <string>Rotation orbit style.
 Trackball: moving the mouse horizontally will rotate the part around the y-axis
-Turntable: the part will be rotated around the z-axis.</string>
+Turntable: the part will be rotated around the z-axis (with constrained axes).
+Free Turntable: the part will be rotated around the z-axis.</string>
         </property>
         <property name="currentIndex">
-         <number>1</number>
+         <number>0</number>
         </property>
         <item>
          <property name="text">
@@ -294,6 +295,11 @@ Turntable: the part will be rotated around the z-axis.</string>
           <string>Trackball</string>
          </property>
         </item>
+        <item>
+         <property name="text">
+          <string>Free Turntable</string>
+         </property>
+        </item>
        </widget>
       </item>
       <item row="2" column="0">

src/Gui/NavigationStyle.cpp

@@ -85,7 +85,8 @@ class FCSphereSheetProjector : public SbSphereSheetProjector {
 public:
     enum OrbitStyle {
         Turntable,
-        Trackball
+        Trackball,
+        FreeTurntable
     };
 
     FCSphereSheetProjector(const SbSphere & sph, const SbBool orienttoeye = true)
@@ -114,33 +115,46 @@ public:
         SbRotation rot = inherited::getRotation(point1, point2);
         if (orbit == Trackball)
             return rot;
-
-        // 0000333: Turntable camera rotation
-        SbVec3f axis;
-        float angle;
-        rot.getValue(axis, angle);
-        SbVec3f dif = point1 - point2;
-        if (fabs(dif[1]) > fabs(dif[0])) {
-            SbVec3f xaxis(1,0,0);
-            if (dif[1] < 0)
-                angle = -angle;
-            rot.setValue(xaxis, angle);
-        }
-        else {
-            SbVec3f zaxis(0,0,1);
-            this->worldToScreen.multDirMatrix(zaxis, zaxis);
-            if (zaxis[1] < 0) {
-                if (dif[0] < 0)
+        else if (orbit == Turntable) {
+            SbVec3f axis;
+            float angle;
+            rot.getValue(axis, angle);
+            SbVec3f dif = point1 - point2;
+            if (fabs(dif[1]) > fabs(dif[0])) {
+                SbVec3f xaxis(1,0,0);
+                if (dif[1] < 0)
                     angle = -angle;
+                rot.setValue(xaxis, angle);
             }
             else {
-                if (dif[0] > 0)
-                    angle = -angle;
+                SbVec3f zaxis(0,0,1);
+                this->worldToScreen.multDirMatrix(zaxis, zaxis);
+                if (zaxis[1] < 0) {
+                    if (dif[0] < 0)
+                        angle = -angle;
+                }
+                else {
+                    if (dif[0] > 0)
+                        angle = -angle;
+                }
+                rot.setValue(zaxis, angle);
             }
-            rot.setValue(zaxis, angle);
-        }
 
-        return rot;
+            return rot;
+        } else {
+            // Turntable without constraints
+            SbRotation zrot, xrot;
+            SbVec3f dif = point1 - point2;
+
+            SbVec3f zaxis(1,0,0);
+            zrot.setValue(zaxis, dif[1]);
+
+            SbVec3f xaxis(0,0,1);
+            this->worldToScreen.multDirMatrix(xaxis, xaxis);
+            xrot.setValue(xaxis, -dif[0]);
+
+            return zrot * xrot;
+        }
     }
 
     void setOrbitStyle(OrbitStyle style)

src/Gui/NavigationStyle.h

@@ -99,7 +99,8 @@ public:
 
     enum OrbitStyle {
         Turntable,
-        Trackball
+        Trackball,
+        FreeTurntable
     };
 
     enum class RotationCenterMode {

src/Mod/Tux/NavigationIndicatorGui.py

@@ -333,6 +333,7 @@ def retranslateUi():
     aCompact.setText(translate("NavigationIndicator", "Compact"))
     aTooltip.setText(translate("NavigationIndicator", "Tooltip"))
     aTurntable.setText(translate("NavigationIndicator", "Turntable"))
+    aFreeTurntable.setText(translate("NavigationIndicator", "FreeTurntable"))
     aTrackball.setText(translate("NavigationIndicator", "Trackball"))
     a0.setText(translate("NavigationIndicator", "Undefined"))
 
@@ -358,13 +359,18 @@ gOrbit = QtGui.QActionGroup(menuSettings)
 aTurntable = QtGui.QAction(gOrbit)
 aTurntable.setObjectName("NavigationIndicator_Turntable")
 aTurntable.setCheckable(True)
+aFreeTurntable = QtGui.QAction(gOrbit)
+aFreeTurntable.setObjectName("NavigationIndicator_FreeTurntable")
+aFreeTurntable.setCheckable(True)
 aTrackball = QtGui.QAction(gOrbit)
 aTrackball.setObjectName("NavigationIndicator_Trackball")
 aTrackball.setCheckable(True)
 
+menuOrbit.addAction(aFreeTurntable)
 menuOrbit.addAction(aTurntable)
 menuOrbit.addAction(aTrackball)
 
+
 menuSettings.addMenu(menuOrbit)
 menuSettings.addSeparator()
 menuSettings.addAction(aCompact)
@@ -504,18 +510,22 @@ def onOrbit():
 
     if aTurntable.isChecked():
         pView.SetInt("OrbitStyle", 0)
-    else:
+    elif aTrackball.isChecked():
         pView.SetInt("OrbitStyle", 1)
+    elif aFreeTurntable.isChecked():
+        pView.SetInt("OrbitStyle", 2)
 
 
 def onOrbitShow():
     """Set turntable or trackball orbit style."""
 
     gOrbit.blockSignals(True)
-    if pView.GetInt("OrbitStyle", 1):
-        aTrackball.setChecked(True)
-    else:
+    if pView.GetInt("OrbitStyle", 0):
         aTurntable.setChecked(True)
+    elif pView.GetInt("OrbitStyle", 1):
+        aTrackball.setChecked(True)
+    elif pView.GetInt("OrbitStyle", 2):
+        aFreeTurntable.setChecked(True)
     gOrbit.blockSignals(False)